US4627828A - Toothed belt - Google Patents

Toothed belt Download PDF

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Publication number
US4627828A
US4627828A US06/583,465 US58346584A US4627828A US 4627828 A US4627828 A US 4627828A US 58346584 A US58346584 A US 58346584A US 4627828 A US4627828 A US 4627828A
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US
United States
Prior art keywords
belt
yarn
toothed belt
fabric layer
teeth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/583,465
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English (en)
Inventor
Takaji Nagai
Hiroyuki Ookawa
Takahide Mizuno
Fumihito Nakagawa
Yoshiaki Onaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsuboshi Belting Ltd
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Mitsuboshi Belting Ltd
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Filing date
Publication date
Application filed by Mitsuboshi Belting Ltd filed Critical Mitsuboshi Belting Ltd
Assigned to MITSUBOSHI BELTING LTD. reassignment MITSUBOSHI BELTING LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MIZUNO, TAKAHIDE, NAGAI, TAKAJI, NAKAGAWA, FUMIHITO, ONAKA, YOSHIAKI, OOKAWA, HIROYUKI
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/28—Driving-belts with a contact surface of special shape, e.g. toothed

Definitions

  • the present invention relates to a toothed belt. More particularly, the invention relates to a toothed belt having teeth having improved durability.
  • a toothed belt transmits power via teeth which engage with the teeth of a pulley.
  • a high shearing stress acts on the teeth of the belt at the point where they engage with the teeth of the pulley.
  • PLD which stands for pitch line difference
  • PLD increases, and the wear of the teeth is accelerated due to interference between the teeth and the pulley at the time that the teeth engage with the pulley.
  • PLD can be reduced by employing a thin fabric layer. Doing so, however, unavoidably reduces the wear resistance of the belt.
  • Still another approach as disclosed in Japanese Published Patent Application No. 30135/1980, is to employ two or more layers of a rigid fabric. Although this approach may result in a lowered deformation of the teeth, the amount of shear stress on the teeth is increased. Also, the possibility of separation between a fabric layer and the rubber material of the belt increases as the hardness of the fabric increases. Because, when an extraordinary large stress is applied to the belt, the tooth is largely deformed but the rigid fabric layer disposed on the rubber material is not deformed in the same way as the tooth.
  • FIG. 2 shows in cross section a segment of a toothed belt employing fabric layers
  • a fabric layer C will not completely follow the deformation of the tooth, and hence separation of the rubber R of the belt and the fabric layer C can occur.
  • a fabric which is easily deformable and which has a large stretchability can be employed.
  • employing a fabric having a large stretchability leads to crack formation at the base of the teeth T due to the large amount of deformation which the tooth will inevitably undergo.
  • a toothed belt having two fabric layers of different stretchability.
  • the two fabric layers are laminated and bonded to the surface of the rubber material of the teeth of the belt. It has been found that this structure both reduces the amount of deformation of the teeth of the belt and also increases the wear resistance of the belt.
  • FIG. 1 is a graph showing the relationship between the number of teeth on a belt engaged with a pulley and the shear stress acting on the teeth;
  • FIG. 2 is a cross-sectional side view showing the deformed state of a conventional toothed belt having a fabric layer
  • FIG. 3 is a cross-sectional side view showing a toothed belt constructed in accordance with a first preferred embodiment of the invention
  • FIG. 4 is a graph showing the relationship between the sum of cover factors of the warp and weft of a fabric and the number of separations of the layers of the belt;
  • FIG. 5 is a schematic view of a drive testing machine for toothed belts
  • FIG. 6 is a cross-sectional view of another embodiment of a toothed belt of the invention.
  • FIG. 7 is a graph showing the relationship between the height of undulations of a fabric layer and the rigidity of a belt tooth
  • FIG. 8 is a graph showing the relationship between the height of undulations of a fabric layer and the expected lifetime of the belt
  • FIG. 9 is a cross-sectional side view showing a still further embodiment of a toothed belt of the invention.
  • Reference numeral 1 designates a reinforcing cord formed of polyester, nylon, aromatic polyamide, rayon or glass fiber and embedded in a rubber layer 2.
  • the rubber layer 2 may be formed of natural rubber, one or a blend of various synthetic rubbers or urethane elastomer.
  • reference numeral 3 designates a tooth which is integral with the rubber layer 2.
  • the warp of the inner fabric layer 4 is formed by threads made of nylon, polyester or aromatic polyamide filamentary or spun yarn, crimped yarn or core yarn, and which are very thin, typically 30 to 210 d.
  • the weft of the layer 4 is formed of the same material. The sum of the cover factors of the warp and weft should be 20 or less, that is, the surface of the layer 4 should be relatively rough. The stretchability of the layer 4 should be in a range of 67 to 430%.
  • the warp and weft of the outer layer 5 are formed of twisted yarns of nylon, polyester or aromatic polyamide and are relatively thick, preferably, 200 to 800 d.
  • the cover factors of the warp and weft of the outer layer 5 should be larger than those of the warp and weft of the inner layer 4.
  • the stretchability of the outer layer 5 should be in the range of 42 to 370%. As shown in FIG. 3, the outer layer 5 should cover the inner layer 4.
  • the cover factor mentioned above relates to the density of the yarn used to form the warp or weft.
  • the relationship between the density of the fabric and the average time before separation for a fixed, predetermined load is shown by the graph of FIG. 4. More specifically, as shown in FIG. 4, if the sum of the cover factors of the warp and weft of the inner layer 4 is greater than about 20, the densities of the warp and weft become particularly large. In such a case, the bonding between the outer layer 5 and the rubber 3 is markedly reduced.
  • the precise values of the stretchabilities of the two layers should be chosen in accordance with the type of rubber employed, the shape of the teeth, the number of teeth on the belt, and the loading conditions which the belt is expected to endure.
  • Typical values of the stretchabilities of the inner and outer layers are 220% and 130%, respectively.
  • the overall thickness of the fabric layers is unavoidably increased, resulting in an increase in PLD. If a standard ISO pulley is used with a belt having more than two fabric layers, the belt tends to wear rapidly.
  • the precise thicknesses of the two layers should be chosen in accordance with the tooth shape.
  • the inner and outer fabric layers are coated with a layer of 3 to 30% rubber paste. After being laid on the rubber material of the belt, heat or a solvent is applied to effect bonding between the two fabric layers and the rubber material. Pressurized bonding may be used.
  • the mesh openings in the two fabric layers should, of course, be sufficiently big to allow fluidized rubber to flow therethrough to permit a sufficient degree of bonding to the rubber substrate of the belt.
  • Table 1 below shows some specific examples of toothed belts constructed in accordance with the present invention.
  • a belt constructed in accordance with the invention was compared with a conventional belt using a testing machine as illustrated in FIG. 5.
  • the number of teeth on the two pulleys D r and D n were 20 and 40, respectively.
  • Conditions employed were a speed of 7,000 r.p.m., a load of 5 horsepower, and 80° C. ambient temperature. It was found that the belt of the invention had about 1.5 times the lifetime of 1,200 hours of the conventional belt.
  • FIG. 6 Another embodiment of a belt of the invention is seen in the cross-sectional view of FIG. 6.
  • reference numerals 21 through 25 designate elements in common with the first preferred embodiment of the invention described above.
  • the inner fabric layer 24 has an undulated shape in the longitudinal direction of the belt.
  • the rigidity (Young's modulus) of the teeth of the belt increases as the height t of the undulations is increased, thereby increasing the expected lifetime of the belt due to reduced wear at the teeth.
  • the height of the undulations is excessively increased, the amount of heat generated in the teeth will be excessive, leading to separation of the fabric layers from the rubber substrate of the belt.
  • the belts tested had the shape of undulations shown in FIG. 6.
  • the invention is not limited to that particular shape. Particularly, it is possible to employ multiple undulations in a single tooth. Such an embodiment is illustrated in FIG. 9.
  • a drive belt having inner and outer reinforcing fabric layers.
  • the inner layer has a larger mesh size than the outer layer, and also a greater stretchability.
  • the inner fabric layer has a fine warp of 30 to 210 d and a normal weft. The sum of the cover factors of the warp and weft of the inner fabric layer is less than or equal to 20.
  • the outer layer which has a relatively low stretchability, has a normal warp and weft. Because of its rough mesh, the inner layer is very firmly bonded to the rubber substrate of the belt. The inner layer can easily follow the deformation of the teeth, but the outer layer is relatively rigid. This reduces PLD and prevents wear of the outer surfaces of the teeth.
  • the belt of the invention achieves an increased expected lifetime due to a reduction in cracking and wear, even under high load conditions.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Woven Fabrics (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Pulleys (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
US06/583,465 1983-10-07 1984-02-24 Toothed belt Expired - Fee Related US4627828A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP58-156626[U] 1983-10-07
JP1983156626U JPS6062641U (ja) 1983-10-07 1983-10-07 歯付ベルト

Publications (1)

Publication Number Publication Date
US4627828A true US4627828A (en) 1986-12-09

Family

ID=15631808

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/583,465 Expired - Fee Related US4627828A (en) 1983-10-07 1984-02-24 Toothed belt

Country Status (5)

Country Link
US (1) US4627828A (zh)
EP (1) EP0139341B1 (zh)
JP (1) JPS6062641U (zh)
AT (1) ATE44591T1 (zh)
DE (1) DE3478947D1 (zh)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5531649A (en) * 1993-10-13 1996-07-02 Mitsuboshi Belting Ltd. Toothed power transmission belt
US5651745A (en) * 1995-06-08 1997-07-29 Childress; Ellen Carol Motion transfer device
CN1039598C (zh) * 1993-12-25 1998-08-26 朱达汉 粉粒状组合即用浆料及其制备方法
US6485386B2 (en) * 2000-05-18 2002-11-26 The Gates Corporation Transverse reinforced CVT belt
EP1265003A1 (en) * 2001-06-08 2002-12-11 DAYCO EUROPE S.r.l. Toothed belt
US8932165B2 (en) 2006-03-31 2015-01-13 The Gates Corporation Toothed power transmission belt
US10514083B2 (en) * 2016-08-16 2019-12-24 Contitech Antriebssysteme Gmbh Cross-linked elastomeric low friction faced synchronous power transmission belt
US10989274B2 (en) * 2017-04-27 2021-04-27 Gates Corporation Synchronous belt with stiffened teeth
US20240077131A1 (en) * 2021-01-25 2024-03-07 Mitsuboshi Belting Ltd. Toothed Belt
US20240102534A1 (en) * 2021-04-30 2024-03-28 Bando Chemical Industries, Ltd. Toothed belt

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT391746B (de) * 1985-06-28 1990-11-26 Bruss Polt I Verbindung fuer einen zahnriemen
JPS6362933A (ja) * 1986-09-01 1988-03-19 Mitsuboshi Belting Ltd 歯付きベルト
EP0345367A1 (de) * 1988-06-08 1989-12-13 OLBO Textilwerke GmbH Verfahren zum Herstellen von Zahnriemen od.dgl. und danach hergestellter Zahnriemen
JPH074359Y2 (ja) * 1990-07-10 1995-02-01 三ツ星ベルト株式会社 歯付ベルト
JP2545208Y2 (ja) * 1992-10-13 1997-08-25 株式会社椿本チエイン 歯付ベルト
US5362281A (en) * 1993-04-08 1994-11-08 The Gates Rubber Company Toothed power transmission belt with fabric reinforcement
NL9301883A (nl) * 1993-11-02 1995-06-01 Drukband Holland B V Drukinrichting voorzien van een drukband.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2182461A (en) * 1938-02-26 1939-12-05 William M Yeakel Belt and method of making same
US2988925A (en) * 1959-10-19 1961-06-20 Us Rubber Co Toothed belt with grooved teeth
US4099422A (en) * 1975-12-05 1978-07-11 Industrie Pirelli S.P.A. Oil resistant toothed belt
JPS58128547A (ja) * 1982-01-27 1983-08-01 Mitsuboshi Belting Ltd 歯付ベルト

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1123096B (it) * 1976-12-30 1986-04-30 Pirelli Cinghia dentata
US4343666A (en) * 1978-11-02 1982-08-10 Dayco Corporation Method of making toothed belt
US4305714A (en) * 1980-05-23 1981-12-15 Dayco Corporation Heavy duty laminated cogged belt
US4392842A (en) * 1980-10-10 1983-07-12 Uniroyal, Inc. Toothed positive drive power transmission belt with a fabric reinforcement suspended within the belt teeth
US4395298A (en) * 1980-11-10 1983-07-26 Dayco Corporation Method and apparatus for making toothed belts and belt made employing same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2182461A (en) * 1938-02-26 1939-12-05 William M Yeakel Belt and method of making same
US2988925A (en) * 1959-10-19 1961-06-20 Us Rubber Co Toothed belt with grooved teeth
US4099422A (en) * 1975-12-05 1978-07-11 Industrie Pirelli S.P.A. Oil resistant toothed belt
JPS58128547A (ja) * 1982-01-27 1983-08-01 Mitsuboshi Belting Ltd 歯付ベルト

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5531649A (en) * 1993-10-13 1996-07-02 Mitsuboshi Belting Ltd. Toothed power transmission belt
CN1039598C (zh) * 1993-12-25 1998-08-26 朱达汉 粉粒状组合即用浆料及其制备方法
US5651745A (en) * 1995-06-08 1997-07-29 Childress; Ellen Carol Motion transfer device
US5800300A (en) * 1995-06-08 1998-09-01 Childress; Ellen Motion transfer device
US6485386B2 (en) * 2000-05-18 2002-11-26 The Gates Corporation Transverse reinforced CVT belt
EP1265003A1 (en) * 2001-06-08 2002-12-11 DAYCO EUROPE S.r.l. Toothed belt
US8932165B2 (en) 2006-03-31 2015-01-13 The Gates Corporation Toothed power transmission belt
US10514083B2 (en) * 2016-08-16 2019-12-24 Contitech Antriebssysteme Gmbh Cross-linked elastomeric low friction faced synchronous power transmission belt
US10989274B2 (en) * 2017-04-27 2021-04-27 Gates Corporation Synchronous belt with stiffened teeth
US20240077131A1 (en) * 2021-01-25 2024-03-07 Mitsuboshi Belting Ltd. Toothed Belt
US20240102534A1 (en) * 2021-04-30 2024-03-28 Bando Chemical Industries, Ltd. Toothed belt

Also Published As

Publication number Publication date
EP0139341B1 (en) 1989-07-12
JPS6132187Y2 (zh) 1986-09-19
EP0139341A3 (en) 1986-05-14
JPS6062641U (ja) 1985-05-01
EP0139341A2 (en) 1985-05-02
ATE44591T1 (de) 1989-07-15
DE3478947D1 (en) 1989-08-17

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Owner name: MITSUBOSHI BELTING LTD. NO. 1-21, HAMAZOEDORI 4-CH

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